单项选择题

Artificial rainmaking has been most successful in the ______.

A．lake area
B．western slope of mountains
C．prairie lands
D．windward side of mountains
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单项选择题
The observation of weather conditions by satellites is advantageous because it ______.
A．enables man to alter the weather
B．makes weather prediction easier
C．gives the scientific information not obtained readily otherwise
D．uses electronic instruments
单项选择题
The word gains in the second sentence in the last paragraph means ______.
A．increases
B．progresses
C．profits
D．things
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